The pH of a solution is 3. When its pH changes to 6, then H⁺ ion concentration:

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Question

This question was previously asked in

RRB ALP Previous Paper 10 (Held On: 10 Aug 2018 Shift 1)

Answer 1

The correct answer is option 4, i.e., Decreases 1000 times.
When its pH changes to 6, then H+ ion concentration, decreases 1000 times.
pH tells the concentration of hydrogen ions, lower the pH, higher is the hydrogen ion concentration.
Acids have pH ranging from 1-6, pH 7 denotes neutral solution, and pH in the range of 8-14 denotes bases.
The formula for calculating pH is: pH = - log [H +]
- pH of 3 = 10 -3 H +
- pH of 6 = 10 -6 H +
From the above values, we can clearly see that H + ion concentration decreases by 1000 times.